美国气体协会测定了输气管在各种状况下的绝对粗糙度。The gas society measured the absolute roughness of the pipe under various conditions.
美国气体协会测定了输气管在各种状况下的绝对粗糙度。The gas society measured the absolute roughness of the pipe under various conditions.
参考答案和解析
A
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